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2 Jurek Z. J.

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On relations between Urbanik and Mehler semigroups

Jurek Z. J.

Probability and Mathematical Statistics

2009

Vol. 29, Fasc. 2

297--308

It is shown that operator-selfdecomposable measures or, more precisely, their Urbanik decomposability semigroups induce generalized Mehler semigroups of bounded linear operators. Moreover, those semigroups can be represented as random integrals of operator valued functions with respect to stochastic Lévy processes. Our Banach space setting is in contrast with the Hilbert spaces on which so far and most often the generalized Mehler semigroups were studied. Furthermore, we give new proofs of the random integral representation.

Cauchy transforms of measures viewed as some functionals of Fourier transforms

Jurek Z. J.

Probability and Mathematical Statistics

2006

Vol. 26, Fasc. 1

187--200

The Cauchy transform of a positive measure plays an important role in complex analysis and more recently in so-called free probability. We show here that the Cauchy transform restricted to the imaginary axis can be viewed as the Fourier transform of some corresponding measures. Thus this allows the full use of that classical tool. Furthermore, we relate restricted Cauchy transforms to classical com- pound Poisson measures, exponential mixtures, geometric infinite divisibility and free-infinite divisibility. Finally, we illustrate our approach with some examples.